I just looked again at Calibre 4.2 and the new viewer on my spare 32 bit Linux laptop.
The viewer defaults are not what I 'd use, however configuring to have two panes with TOC in left like the 3.48 viewer and a scroll bar on the right and font size I wanted was simple. So the new Viewer now seems to work fine and can be used just like the old one. Fast enough on ancient HP530 with 4G RAM, Linux Mint 32 bit 18.3 and Mate desktop.
I'll test some more docx to epub2 and dual mobi on it before upgrading the main 64 bit linux laptop.
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